socket: General socket manipulations

IP socket functions
int	socket_tcp4 (void)
int	socket_tcp6 (void)
int	socket_tcp (void)
int	socket_udp4 (void)
int	socket_udp6 (void)
int	socket_udp (void)
int	socket_connect4 (int sock, const ipv4addr *ip, ipv4port port)
int	socket_connect4_timeout (int sock, const ipv4addr *ip, ipv4port port, int timeout)
int	socket_connect6 (int sock, const ipv6addr *ip, ipv6port port)
int	socket_connect6_timeout (int sock, const ipv6addr *ip, ipv6port port, int timeout)
int	socket_bind4 (int sock, const ipv4addr *ip, ipv4port port)
int	socket_bind6 (int sock, const ipv6addr *ip, ipv6port port)
int	socket_accept4 (int sock, ipv4addr *ip, ipv4port *port)
int	socket_accept6 (int sock, ipv6addr *ip, ipv6port *port)
int	socket_recv4 (int sock, char *buffer, unsigned buflen, ipv4addr *ip, ipv4port *port)
int	socket_recv6 (int sock, char *buffer, unsigned buflen, ipv6addr *ip, ipv6port *port)
int	socket_send4 (int sock, const char *buffer, unsigned buflen, const ipv4addr *ip, ipv4port port)
int	socket_send6 (int sock, const char *buffer, unsigned buflen, const ipv6addr *ip, ipv6port port)
int	socket_getaddr4 (int sock, ipv4addr *ip, ipv4port *port)
int	socket_getaddr6 (int sock, ipv6addr *ip, ipv6port *port)
int	socket_cork (int sock)
int	socket_uncork (int sock)
int	socket_notcpdelay (int sock, int enable)

UNIX local-domain socket functions
int	socket_unixdgm (void)
int	socket_unixstr (void)
int	socket_connectu (int sock, const char *path)
int	socket_connectu_timeout (int sock, const char *path, int timeout)
int	socket_bindu (int sock, const char *path)
int	socket_acceptu (int sock)
int	socket_recvu (int sock, char *buffer, unsigned buflen)
int	socket_sendu (int sock, const char *buffer, unsigned buflen)
int	socket_pairstr (int fd[2])
int	socket_pairdgm (int fd[2])

Functions for any type of socket
int	socket_broadcast (int sock)
int	socket_connected (int sock)
int	socket_linger (int fd, int onoff, int seconds)
int	socket_listen (int sock, int backlog)
int	socket_reuse (int sock)
int	socket_shutdown (int sock, int shut_rd, int shut_wr)
int	socket_sendfd (int sock, int fd)
int	socket_recvfd (int sock)

Detailed Description

Calling Convention

When calling a socket function, the socket file descriptor (where required) will always be the first parameter. Functions that return a file descriptor (either creating a new socket or accepting a connection on a socket return that file descriptor on success or -1 on error. All other functions return non-zero (true) on success or 0 (false) on error. All functions set errno on error.

Function Documentation

socket_accept4()

int socket_accept4	(	int	sock,
		ipv4addr *	ip,
		ipv4port *	port
	)

Accept a connection on a socket from an IPv4 address.

References ipv4addr::addr.

socket_accept6()

int socket_accept6	(	int	sock,
		ipv6addr *	ip,
		ipv6port *	port
	)

Accept a connection on a socket from an IPv6 address.

References ipv6addr::addr.

socket_acceptu()

int socket_acceptu

(

int

sock

)

Accept a UNIX domain connection.

socket_bind4()

int socket_bind4	(	int	sock,
		const ipv4addr *	ip,
		ipv4port	port
	)

Bind a socket to an IPv4 address.

References ipv4addr::addr.

Referenced by dns_transmit_free(), and socket_connect4().

socket_bind6()

int socket_bind6	(	int	sock,
		const ipv6addr *	ip,
		ipv6port	port
	)

Bind a socket to an IPv6 address.

References ipv6addr::addr.

socket_bindu()

int socket_bindu	(	int	sock,
		const char *	path
	)

Bind a UNIX domain address (path) to a socket.

socket_broadcast()

int socket_broadcast

(

int

fd

)

Mark a socket for broadcast transmission.

socket_connect4()

int socket_connect4	(	int	sock,
		const ipv4addr *	ip,
		ipv4port	port
	)

Connect a socket to an IPv4 address.

References ipv4addr::addr, IPV4ADDR_ANY, IPV4ADDR_LOOPBACK, socket_bind4(), socket_listen(), socket_reuse(), and socket_tcp4().

Referenced by dns_transmit_free(), and socket_connect4_timeout().

socket_connect4_timeout()

int socket_connect4_timeout	(	int	sock,
		const ipv4addr *	ip,
		ipv4port	port,
		int	timeout
	)

Connect a socket to an IPv4 address, honouring a timeout.

Note

The socket will have nonblocking mode turned on on return from this function.

References socket_connect4(), and socket_connected().

socket_connect6()

int socket_connect6	(	int	sock,
		const ipv6addr *	ip,
		ipv6port	port
	)

Connect a socket to an IPv6 address.

References ipv6addr::addr.

Referenced by socket_connect6_timeout().

socket_connect6_timeout()

int socket_connect6_timeout	(	int	sock,
		const ipv6addr *	ip,
		ipv6port	port,
		int	timeout
	)

Connect a socket to an IPv6 address, honouring a timeout.

Note

The socket will have nonblocking mode turned on on return from this function.

References socket_connect6(), and socket_connected().

socket_connected()

int socket_connected

(

int

sock

)

Test if a socket is connected.

Referenced by dns_transmit_get(), socket_connect4_timeout(), socket_connect6_timeout(), and socket_connectu_timeout().

socket_connectu()

int socket_connectu	(	int	sock,
		const char *	path
	)

Make an UNIX domain connection.

Referenced by socket_connectu_timeout().

socket_connectu_timeout()

int socket_connectu_timeout	(	int	sock,
		const char *	path,
		int	timeout
	)

Connect a socket to an UNIX domain address, honouring a timeout.

Note

The socket will have nonblocking mode turned on on return from this function.

References socket_connected(), and socket_connectu().

socket_cork()

int socket_cork

(

int

sock

)

Stop a TCP socket from sending short writes.

Several UNIX OS's have a facility which can prevent packets from being sent across the wire until they are completely full, even if short writes are sent to the socket that would normally result in output packets. This routine attempts to enable that facility to optimize throughput for bulk data transfers. It is known to work on Linux (with the TCP_CORK option) and to at least compile on BSD (with the TCP_NOPUSH option). On OS's which lack either of these two options, this function is essentially a no-op.

socket_getaddr4()

int socket_getaddr4	(	int	sock,
		ipv4addr *	addr,
		ipv4port *	port
	)

Determine the IPv4 address of a socket.

References ipv4addr::addr.

socket_getaddr6()

int socket_getaddr6	(	int	sock,
		ipv6addr *	addr,
		ipv6port *	port
	)

Determine the IPv6 address of a socket.

References ipv6addr::addr.

socket_linger()

int socket_linger	(	int	fd,
		int	onoff,
		int	seconds
	)

Set the socket "linger" option.

socket_listen()

int socket_listen	(	int	sock,
		int	backlog
	)

Listen to a socket.

Referenced by socket_connect4().

socket_notcpdelay()

int socket_notcpdelay	(	int	fd,
		int	on
	)

Turn on or off TCP NODELAY flag.

Enabling NODELAY disables the standard Nagle algorithm, which tries to coalesce multiple short writes into one larger packet for better network efficiency. With NODELAY enabled, each write will immediately be sent out onto the network as a seperate packet.

socket_pairdgm()

int socket_pairdgm

(

int

fd[2]

)

Create a pair of datagram sockets.

socket_pairstr()

int socket_pairstr

(

int

fd[2]

)

Create a pair of stream sockets.

socket_recv4()

int socket_recv4	(	int	sock,
		char *	buffer,
		unsigned	buflen,
		ipv4addr *	ip,
		ipv4port *	port
	)

Receive a datagram from a UDP socket.

References ipv4addr::addr.

socket_recv6()

int socket_recv6	(	int	sock,
		char *	buffer,
		unsigned	buflen,
		ipv6addr *	ip,
		ipv6port *	port
	)

Receive a datagram from an IPv6 UDP socket.

References ipv6addr::addr.

socket_recvfd()

int socket_recvfd

(

int

sock

)

Receive a file descriptor over a socket.

socket_recvu()

int socket_recvu	(	int	sock,
		char *	buffer,
		unsigned	buflen
	)

Receive a datagram from a UNIX domain socket.

socket_reuse()

int socket_reuse

(

int

fd

)

Mark a socket for address reuse.

Referenced by socket_connect4().

socket_send4()

int socket_send4	(	int	sock,
		const char *	buffer,
		unsigned	buflen,
		const ipv4addr *	ip,
		ipv4port	port
	)

Send a datagram on a UDP socket.

References ipv4addr::addr.

socket_send6()

int socket_send6	(	int	sock,
		const char *	buffer,
		unsigned	buflen,
		const ipv6addr *	ip,
		ipv6port	port
	)

Send a datagram on an IPv6 UDP socket.

References ipv6addr::addr.

socket_sendfd()

int socket_sendfd	(	int	sock,
		int	fd
	)

Send a file descriptor over a socket.

socket_sendu()

int socket_sendu	(	int	sock,
		const char *	buffer,
		unsigned	buflen
	)

Send a datagram on a UNIX domain socket.

socket_shutdown()

int socket_shutdown	(	int	sock,
		int	shut_rd,
		int	shut_wr
	)

Shut down part or all of a socket.

socket_tcp()

int socket_tcp

(

void

)

Create a TCP/IP socket.

References socket_tcp4().

Referenced by dns_transmit_free().

socket_tcp4()

int socket_tcp4

(

void

)

Create a TCP/IPv4 socket.

Referenced by socket_connect4(), and socket_tcp().

socket_tcp6()

int socket_tcp6

(

void

)

Create a TCP/IPv6 socket.

socket_udp()

int socket_udp

(

void

)

Create a UDP/IP socket.

References socket_udp4().

Referenced by dns_transmit_free().

socket_udp4()

int socket_udp4

(

void

)

Create a UDP/IPv4 socket.

Referenced by socket_udp().

socket_udp6()

int socket_udp6

(

void

)

Create a UDP/IPv6 socket.

socket_uncork()

int socket_uncork

(

int

sock

)

Unstop a TCP socket from sending short writes.

socket_unixdgm()

int socket_unixdgm

(

void

)

Create UNIX domain datagram socket.

socket_unixstr()

int socket_unixstr

(

void

)

Create UNIX domain stream socket.